• Neovim is a modern perspective on the classic "vi" text editor.
• Pypy is a fast implementation of the Python programming language.
• #! (or "shebang") is a way of telling a Unix (incl. MacOS) or Linux kernel to run a script under a specific command interpreter.

Out of the box, Neovim knows to treat files containing #!/usr/bin/env nodejs as Javascript, but for some reason, it doesn't treat files with #!/usr/bin/env pypy3 as Python.

Until Neovim can get this sorted out, you can change your own neovim config to do it anyway, by putting something like:

" au BufEnter *         if getline(1) =~ "^#!.*pypy.*$" | set filetype=python | finish | endif
if getline(1) =~ "^#!.*pypy.*$"
    set filetype=python
    finish
" elseif getline(1) =~ "whatever""
"   set filetype=whatever
endif
        

vim.filetype.add {
  pattern = {
    [".*"] = function(_, bufnr)
      local first_line = vim.api.nvim_buf_get_lines(bufnr, 0, 1, false)[1] or ""
      if first_line:match "^#!.*pypy.*$" then return "python" end
      -- if nothing is returned, it uses the default filetype
    end,
  },
}

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